Python Scripts for ABAQUS: Learn by Example

747 Pages·2016·182.31 MB·English

by  Puri G.M.

PYTHON SCRIPTS FOR
ABAQUS
BY
LEARN EXAMPLE
· Gautam Puri
~:·
""~' t ' '
Dedicated to Mom
f-irst Edition 2011
Copyright ID 2011, Gautam Puri. All rights reserved.
The contents of this publication are the sole intellectual property of the author Gautam Puri. No part of this
publication may be reproduced, altered or distributed in any form or by any means, electronic, mechanical,
photocopying, recording, scanning, or otherwise, without the prior written consent of the author. This
document may NOT be posted anywhere on the internet, including but not limited to personal or commercial
websites, forums, private intranets, online storage locations (Rapidshare, Megaupload, etc.) and file sharing
(P2P I torrent I IRC etc.) portals or applications, nor may it be stored in a data base or retrieval system.
This book is neither owned (in part or full) nor endorsed by Dassault Systemes SIMUUA Corporation.
Disclaimer: The author does not offer any warranties for the quality or validity of the information contained
in this book or the included example Python scripts. This book has been written for entertainment purposes
only and should be treated as such. The reader is responsible for the accuracy and usefulness of any analyses
performed with the Abaqus Software, with or without the use of Python scripts. The reader is also responsible
for the accuracy and usefulness of any non-Abaqus related Python programs or software developed. The
information contained in the book is not intended to be exhaustive or apply to any particular situation and
must therefore be viewed with skepticism and implemented with extreme caution. The Python scripts
available with this book have been included for their instructional value. They have been tested with care but
are not guaranteed for any particular purpose. In no event shall the author be liable for any incidental, indirect
or consequential damages arising from use of this book or the example scripts provided with it.
In plain English, by reading this document you acknowledge that the author is not responsible for your finite
element studies, nor is he responsible for the validity of their results or their interpretation.
Printed in the United States of America
Book website: www.abaquspython.com
Contents
1. A Taste of Scripting 1
1.1 Introduction
1.2 Using a script to define materials
1.3 To script or not to script.. 8
1.4 Running a complete analysis through a script 8
1.5 Conclusion 32
2. Running a Script 33
2.1 Introduction 33
2.2 How Python fits in 33
2.3 Running a script within Abaqus/CAE 34
2.3.1 Running a script in GUl to execute a single or multiple tasks 35
2.3.2 Running a script in GUI to execute an entire simulation 35
2.4 Running a script from the command line 35
2.4.1 Run the script from the command line without the GUI 37
2.4.2 Run the script from the command line with the GU1 38
2.5 Running a script from the command line interface (CLI) 39
2.6 Conclusion 40
3. Python 101 41
3.1 Introduction 41
3.2 Statements · ··:· ' .. 41
stat~~ents
3.3 Variables and"'assign.ment 41
'' I I •
3.4 Lists 44
3.5 Dictionaries 46
3.6 Tu pies 49
3.7 Classes, Objects and Instances 51
3.8 What's next? 59
Contents
11
4. The Basics of Scripting-Cantilever Beam Example 60
4.1 Introduction 60
4.2 A basic script 60
4.3 Breaking down the script 64
4.3.1 Initialization (import required modules) 65
4.3.2 Create the model 67
4.3.3 Create the part 68
4.3.4 Define the materials 71
4.3.5 Create solid sections and make section assignments 72
4.3.6 Create an assembly 74
4.3.7 Create steps 75
4.3.8 Create and define field output requests 76
4.3.9 Create and define history output requests 77
4.3.10 Apply loads 78
4.3. 1 I Apply constraints/boundary conditions 81
4.3.12 Mesh 83
4.3.13 Create and run the job 88
4.3.14 Post processing 89
4.4 What's Next? 90
5. Python 102 92
5.1 Introduction 92
5.1.1 If. .. elif ... else statements 92
5.1.2 For loops 94
5.1.3 range() function 95
5.1.4 While-loops 97
5.1.5 break and continue statements 97
5.2 What's Next? 99
6. Replay files, Macros and IDEs 100
6.1 Introduction 100
6.2 Replay Files 100
6.3 Example - Compare replay with a we11 written script 101
6.4 Macros 106
Contents Ill
6.5 IDEs and Text Editors 109
6.5. 1 IDLE 109
6.5.2 · Notepad ++ 109
6.5.3 Abaqus PDE 110
6.5.4 Other options 113
6.6 What's Next? 114
7. Static Analysis of a Loaded Truss 117
7.1 1n troduction 117
7.2 Procedure in GUl 118
7.3 Python Script 124
7.4 Examining the Script 129
7.4.1 Initialization (import required modules) 129
7.4.2 Create the model 130
7.4.3 Create the part 130
7.4.4 Define the materials 131
7.4.5 Create sections and make section assignments 132
7.4.6 Create an assembly 134
7.4.7 Create steps 135
7.4.8 Create and define field output requests 135
7.4.9 Create and define history output requests 135
7.4.10 Apply loads 136
7.4.11 Apply boundary conditions 137
7.4.12 Mesh 139
7.4.13 Create and run the job 141
7.4.14 Post processing - setting the viewport 141
7.4.15 Plot the defonned state and modify common options 142
7.4.16 Plot the field outputs 143
7.5 Summary 145
8. Explicit Analysis of a Dynamically Loaded Truss 146
8.1 Introduction 146
8.2 Procedure in GUl 147
8.3 Python Script 154
1v Contents
8.3.1 Part, material, section and assembly blocks 160
8.3.2 Creating sets 161
8.3.3 Creating steps 162
8.3.4 Create and define history output requests 163
8.3.5 Apply loads 164
8.3.6 Boundary conditions, mesh, running the job and initial post
processing 164
8.3.7 XY plots of displacement 165
8.4 Summary 170
9. Analysis of a Frame of 1-Beams 171
9.1 Introduction 171
9.2 Procedure in GUT 174
9.3 Python Script 188
9.4 Examining the Script 199
9.4.1 Initialization (import required modules) 199
9.4.2 Create the model 199
9.4.3 Create the part 199
9.4.4 Define the materials 206
9.4.5 Create profiles 206
9.4.6 Create sections and make section assignments 207
9.4.7 Assign section orientations 210
9.4.8 Create an assembly 210
9.4.9 Create connectors using wire features 211
9.4.10 Use constraint equations for two nodes 216
9.4.11 Create steps 218
9.4.12 Create and define field output requests 218
9.4.13 Create and define history output requests 218
9.4.14 Apply loads 218
9.4.15 Apply boundary conditions 220
9.4.16 Mesh 222
9.4.17 Create and run the job 222
9.5 Summary 223
Contents v
10. Bending of a Planar Shell (Plate) 224
10.1 Introduction 224
10.2 Procedure in GUI 226
10.3 Python Script 233
10.4 Examining the Script 239
10 .4.1 Initialization (import required modules) 239
10 .4.2 Create the model 239
I 0.4.3 Create the part 239
I 0.4.4 Define the materials 240
10.4.5 Create solid sections and make section assignments 240
10.4.6 Create an assembly 242
10.4.7 Create steps 242
10.4.8 Create and define field output requests 243
10.4.9 Create and define history output requests 243
10.4.10 Apply boundary conditions 244
10.4.11 Partition part to create vertices 245
10.4.12 Apply loads 248
10.4.13 Mesh 248
10.4.14 Create and run the job 250
10.4.15 Display deformed state with contours 250
I 0.4.16 Write Field Output Report 251
10.5 Summary 252
11. Heat Transfer Analysis 253
1 1.1 Introduction 253
11.2 Procedure in GUI 255
1 1. 3 Python Script 261
1 1 .4 Examining the Script 266
11.4.1 Initialization, creation of the model, part, materials, sections and
assembly 266
I 1.4.2 Create a datum plane and partition the part 266
11.4.3 Create steps 268
1 1.4.4 Apply constraints/boundary conditions 268
11.4.5 Apply loads 269
VI Contents
1 I.4.6 Create interactions 270
11.4.7 Mesh 273
1 I .4.8 Create and run the job 275
1 I .4.9 Post Processing 275
11.5 Summary 278
12. Contact Analysis (Contact Pairs Method) 279
12.1 Introduction 279
12.2 Procedure in GUI 281
12.3 Python Script 291
12.4 Examining the Script 300
I 2.4.1 Initialization (import required modules) 300
12.4.2 Create the model 300
12.4.3 Create the part 301
12.4.4 Define the materials 302
12.4.5 Create solid sections and make section assignments 303
12.4.6 Create an assembly 304
12.4.7 Create steps 309
12.4.8 Create and define field output requests 310
12.4.9 Create and define history output requests 310
12.4.10 Apply boundary conditions 310
12.4.11 Apply loads 312
12.4.12 Create Surfaces 312
12.4.13 Create Interaction Properties 313
12.4.14 Create Interactions 314
12.4.15 Mesh 316
12.4.16 Create and run the job 317
12.4.17 Post Processing- Display deformed state 318
12.5 Summary 318
12.6 What's Next? 318
13. Optimization - Determine the Maximum Plate Bending Loads 319
13.1 Introduction 319
13.2 Methodology 319
Contents vii
13.3 Python Script 321
13.4 Examining the Script 329
13.4.1 Model, Part, Material, Section, Assembly, Step, Field Output
Request, Boundary Condition, Partition and Mesh creation. 329
13.4.2 Initialization 329
13.4.3 Modify and run the analysis at each iteration 330
13.4.4 Print a table of the results 338
13.4.5 Read the report file to determine where the maximum stress was
exceeded 341
13.4.6 Light up elements in the viewport where max stress is exceeded
345
13.4.7 Print messages to the message area 347
13.5 Summary 348
14. Parameterization, Prompt Boxes and XY Plots 349
14.1 Introduction 349
14.2 Methodology 350
14.3 Python Script 351
14.4 Examining the Script 363
14.4.1 Accept inputs 363
14.4.2 Create the model 366
14.4.3 Create part 366
14.4.4 Create a section 367
14.4.5 Create sets 368
14.4.6 Request and use load magnitude 368
14.4.7 Boundary conditions 369
14.4.8 Initial post processing 370
14.4.9 Combined XY plot 371
14.4.10 Chart Options 371
14.4.11 Axis Options 373
14.4.12 Title Options 375
14.4.13 Chart Legend Options 376
14.4.14 XY Curve Options 377
14.4.15 Print the plot to an image 378
14.5 Summary
379
VIII Contents
15. Optimization of a Parameterized Sandwich Structure 380
15.1 Introduction 380
15.2 Procedure in GUI 382
15.3 Python Script 392
15.4 Examining the Script 405
15.4.1 Accept inputs 405
15.4.2 Variable initialization and preliminary calculations 407
15.4.3 Create the model 408
15.4.4 Create the parts, material, section and assembly 408
15.4.5 IdentifY faces and sets 409
15.4.6 Assemble parts 410
15.4.7 Create steps, boundary conditions and loads 411
15.4.8 Surfaces and Tie constraints 412
15.4.9 Mesh and Run Job 413
15.4.1 0 XY Reports 413
15.4.11 Read from report 415
15.4.12 Write to output file 416
15.5 Summary 417
16. Explore an Output Database 418
16.1 Introduction 418
16.2 Methodology 419
16.3 Before we begin - Odb Object Model 420
16.4 How to run the script 423
16.5 Python Script 423
16.5.1 Initialization 429
16.5.2 Mathematical operations on field data 429
16.5.3 Access infonnation about part, nodes, elements, stresses,
displacements 433
I 6.5.4 Display history output information for static truss analysis 441
I 6.5.5 Display history output information for dynamic explicit truss
analysis 444
16.5.6 Extract material and section definitions 447
16.5.7 Extract material and section definitions 449